/**
 * Hex conversion utilities for blockchain data
 *
 * Note: BigInt utilities are available in ../utils
 * Use val.bigint() or bigIntToProtoBigInt() for BigInt conversions
 */
import type { Hex } from 'viem';
/**
 * Convert hex string to Uint8Array
 */
export declare const hexToBytes: (hexStr: string) => Uint8Array;
/**
 * Convert Uint8Array to hex string with 0x prefix
 */
export declare const bytesToHex: (bytes: Uint8Array) => Hex;
/**
 * Encode hex as base64 string
 * @param hex
 * @returns
 */
export declare const hexToBase64: (hex: string) => string;
/**
 * Convert a bigint to a Uint8Array (big-endian byte order).
 * Returns empty array for 0n.
 */
export declare const bigintToBytes: (n: bigint) => Uint8Array;
/**
 * Convert a Uint8Array (big-endian byte order) to a native bigint.
 * Returns 0n for empty array.
 *
 * This is the inverse of `bigintToBytes` and is useful for converting
 * protobuf BigInt's `absVal` field back to a native JS bigint.
 *
 * @example
 * // Convert protobuf BigInt from headerByNumber response
 * const latestBlockNum = bytesToBigint(latestHeader.header.blockNumber!.absVal)
 */
export declare const bytesToBigint: (bytes: Uint8Array) => bigint;